I'm dying to see the stats for the Interceptors, because if i like them enough, I'll consider using them as my sole fighter support for my imperial fleets, and it will look awesome.
From what I've seen of the rebel fighters (I haven't really looked at imp ones), each type is geared towards a specific role. Fighters have different dice vs. other squadrons or capital ships. This means that some are designed to attack ships, whilst others are better at attacking other squadrons. Given their speed I would expect Interceptors to fill the anti-squadron role (I'm not sure how/if this ties in with the lore though).